Rock-drill oscillating valve



Feb. 28, 1928. 1,660,509

G. w. HULSHIZER ROCK DRILL OSCILLATING VALVE Filed Oct. 10 1925 I N V EN TOR. ePlZHa/Lfkyev. 1 I

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Patented Feb. 28, 1928.

UNITED s'ra'rss 1,650,509 PATENT OFFICE.

GEORGE HULSHIZER, OF STEWARTSVILLE, NEW JERSEY, ASSIGNOR TO ENG-ER- SOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

R QCK-DRILL OSCILLATING VALVE.

Application filed 0ctober10, 1925. Serial No. 61,634.

This invention relates to fluid. actuated rock drills, but more particularly to an improved form of oscillating distributing The objects of the invention are to secure a light, quick-acting oscillating'or pivoted valve which may be constructed of tubular form, having convex or cylindrical Seating surfaces cooperating with the hollow 'bore of the valve chest.

Other objects of the invention are to per-' mit the valve to be readily and quickly assembled in the valve chest and obtain a simple and efficient means for restricting'the flow of pressure fluid over one end of th valve as the valve oscillates.

Further objects of the invention will hereinafter appear, and the invention is shown in one of its preferred forms in the ciprocating piston B, valve chest 0 prefer ably formed integral with the cylinder, and the oscillating valve D in the valve chest Pressure fluid for the rock drill is supplied at the inlet E and in this instance the cylinder is provided with the piston controlled free exhaust port F.

Distributing ports G and H lead from the interior of the valve chest to the opposite ends of the cylinder, and portsJ and K afford communication between the inlet and the valve chest.

The valve D is of semi -tubular or trough shaped form, but, for lightness in construction, is preferably cut away at the upper portions L and O, leaving a bridge P at the center through which the pivot pin Q, passes.

The convex seating surfaces R and S of the valve as shown, intersect at an angle to the longitudinal axis of the valve and extend from the central portion T of the valve outwardly to the ends. These convex surfaces and S arepreferably cylindrical and have'the same radius of curvature as the peripheral surface of the bore U of the valve chest, wherewith theycooperate tocontrol the admission of pressure fluid suitable manner, as, for instance, by stainping, or else it may be cut out of a solidbar. of steel or other suitable material. The

valve chest C, for convenience and cheap} nessof construction, is preferably closed at one end V andthe valve is inserted in the chest from the open end W. The pivot Q is inserted transversely through the chest and through'the valve, and a plug X then closes the valve chest. This construction of valve chest and valve is simple and cheap to manufacture and the valve may be readily and quickly inserted in the chest and removed therefrom, I I

In the operation of the device let it be assumed that the piston is moving forwardly, as indicated in Figure 1, in which case pressure fiuiid'is supplied from the inlet E through the port J, over the rearward end Y of'the valve and through the port G to the vrearward end of the cylinder. The forward end ofthe cylinder is open to atmosphere at the exhaust port F so that the for ward cylinder port H is closed by the valve. As the piston overruns the exhaust port'F, as shown in Figure 2, the valve is oscillated on its pivot Q to close the rearward cylinder port G and open the forward cylinder port H to permit pressure fluid to drive the piston rearwardly, and this operation continues as the valve oscillates. This oscillation is caused by compression ahead of or behind the piston, as the case may be.

Means are preferably provided for restricting the flow of air over one or both ends of the valve as the valve oscillates, since the wire drawing effect thus produced aids in throwing the valve quickly. In this instance the restriction is shown at the forward end of the valve, and for this purpose the inner face of the valve chest plug X is bination of a cylinder and piston, a valvev chest having a cylindricalfbore, and a fluid actuated oscillatory distributing valve having convex seating surfaces adapted tov co operate with the peripheral surface ofthe bore for gradually cutting off the admission of pressure fluid to the cylinder.

2. In a fluid actuated-rock drill, the combination of a cylinder and piston, a valve chest, having a cylindrical bore, a fluid actuated oscillatory distributing valve in the bore, and diverging convex seating surfaces of uniform radius throughout theirlengths cooperating with the perlpheral surface of.

the bore for controlling the'adini-ssion of pressure fluid to. the cylinder.

3. In a fluid actuated rock drill, the com.- bination of a cylinder and piston, a valve;

chest having a straight cylindrical bore, and a fluid actuated oscillatory distributing. valve in the bore, said valve having convex. seating surfaces adapted to cooperate with.

the peripheral surface of the, bore for gradually cutting off the admission, of. pressure fluid to the cylinder as the piston; nears the, end. of its stroke, and a pin inserted through.

the valve and the valve chest. to act as: a pivot for the valve.

4. In a fluid actuated rock drill, the com.- bination of a cylinder and piston, a valve chest onthe cylinder having a straight cylindrical bore and a fluid actuated. distributing valve inserted longitudinally in the here, said valve having diverging convex: seating vboreto the ends. ofthecylinder, and a fluid actuated distributing valve in the bore oscillating. in. a plane extending through; the longitudinal. axis of the bore to control the inletpassages, said. valve having diverging convex seating surfaces cooperating with the peripheral surfaceof the bore for gradually cutting ofl the admission of pressure into the cylinder.

6, Ina fluidactuated rock drill, the: combinationv of a cylinder and piston, a valve chest having a cylindrical bore closed at one end, an oscillating distributing valve of form adapted to be inserted longitudinally throughthe open endof said valve chest v said valve having diverging convex. surfaces to cooperate with the peripheral surface of the bore for controlling the admissionof pressure fluid to; the cylinder, and. a plug for closing; said open end. of the valve chest havinga chamber, the edges of. the valve cooperating with thewa-lls of said chamber to restrict the. flow. of pressure fluid at this point as thevalve oscillates.

7. In a fluid actuated rock drill, the combination of a cylinder. and piston, said cylinder having a free exhaust port controlled by thepiston, a; valve chest, having a cylindrical bore, and a fluid actuated oscillatory distributingi, valve having diverging convex seating surfaces adapted to cooperate with the peripheral surface. of the bore for gradually. cutting 'oifthe. admission of pressure fluid to the cylinder.

testimony whereof I have signed this.

specification;

GEDRGEL HULSHIZER. 

